Really urgent! My IPhone 4 won't charge?

I recently got an IPhone 4 about a week ago and everything was working fine on it until a few days ago I plugged it in to charge and it wouldnt charge i switched outlets and blew in the charger and everything I haven't gotten it wet so I don't think thats a problem but anyways the only way it will charge is when i shut it down completely while its connected to the charger and turn it back on. It won't charge any other way. I don't know what to do about it can anyone please help me?

Added (1). Also when i unplug it from the charger the battery life is extremely long there's no other prblems with my phone just that it won't charge

A few phones need to be turned off while on the charger. Consult your owners manual…

Plug it in, hold down the home button and unplug/replug 3 times. Tap the power button 2 times then turn the phone over and rub the apple logo in a clockwise direction 3 rotations. Then hit the volume up button twice then volume down 3 times.

Try use this cable on pc see if it is work, or swap cable if it all work then it is charger, if problemm still exist it is cable if you replace the cable and you still have a problemm then read this article about My iPhone Won't Charge. What Do I Do?:
http://ipod.about.com/od/iphoneipodbattery/tp/Iphone-Wont-Charge.htm
if you found this useful find more tricks on my channel:
http://www.youtube.com/...g_3ZJvk4zA

I would call the tech guys at apple or take it to your nearest store. Have you tried a different charger?
p.s. Just a teeny little bit of advice, blowing into the charger is never a good idea, the moisture from your breath can affect the charger! I realize it sounds ridiculous but its true.

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